This is a Dell 312-0910 compatible 9-Cell Li-ion 11.1V 7800mAh 86Wh battery specifically designed for Dell notebooks. This higher capacity 7800mAh battery packs more punch than the OEM and mimics the OEM form factor. Batteries are 100% tested and compatible for the systems intended for. Battery life depends on many factors including: available DRAM, screen brightness, applications, features, power management, battery condition and other customer preferences. Our part numbers mimic the OEM, and are comparable in form factor and battery life. With our certification test program, we can guarantee your product will work right the first time. Our products are also guaranteed by federal law to not affect or void OEM warranties.